Host Accelerated Modem 56K V.92 Chipset — 536EPXX
Preliminary Datasheet
Intel Confidential
21
6.0
Chipset Descriptions
The 536EPXX is a Host Accelerated Modem chipset family consisting of a DSP (digital signal
processor), and a Silicon Laboratories CODEC/DAA or an Intel Analog Front End (AFE). These
chipsets support a variety of applications and need no additional firmware development. The
current 536EPXXchipsets are shown in
Table 12 “Chipset Composition (PCI & Mini-PCI)”
with
their corresponding DSP and AFE device part numbers. Please contact Intel to verify current part
numbers and technical information.
6.1
Host Controller Software
The host-based controller software contains code for all controller functions for Group 3 Fax mode,
Data mode (including error correction and data compression), and Voice mode.
6.1.1
Digital Signal Processor (DSP)
The DQ82536 digital signal processor (DSP) performs all digital signal processing functions for
the chipset, including modulation, echo cancellation, call progress monitoring, and voice
processing.
The DSP requires a 3.3 V and 1.3 V power supply, which takes advantage of the latest
manufacturing technologies. The PCI bus accommodates either 5-V or 3.3-V designs reducing
power consumption.
6.2
Analog Front End Device (AFE)
The MD1724 AFE device uses Delta-Sigma techniques to convert analog information from a
telephone line to digital information that can be processed by the DSP. In addition to its analog
circuitry, the modem’s Delta-Sigma function incorporates unique and proprietary digital-to-analog
and analog-to-digital features. These features improve receiver accuracy, which in turn improves
performance at low levels of receive signal.
Compared to other analog front-end technologies, the Delta-Sigma implementation better stabilizes
the function of the AFE devices and makes them less sensitive to board layout than other analog
front end technologies. Since a significant amount of signal processing is performed by digital
rather than analog techniques, Delta-Sigma analog-to-digital conversion considerably improves
signal quality.
For basic data, fax, and voice modes of operation, a single AFE device is needed. For full-duplex
echo cancelled speakerphone applications, an additional AFE device is required. The AFEs require
a 5-V power supply; however, the interface is 3.3-V–capable.
6.3
CODEC/DAA
The 536EPXX chipset uses a Silicon DAA to interface to the telephone line. The Silicon DAA
replaces an analog front end (AFE), an isolation transformer, relays, opto-isolators and a hybrid.
